نتایج جستجو برای: iron based superconductor
تعداد نتایج: 3065996 فیلتر نتایج به سال:
We report an in-plane optical spectroscopy study on the newly discovered iron-selenide superconductor K0.75Fe1.75Se2. The measurement revealed the development of a sharp reflectance edge at very low frequency below Tc on the relatively incoherent electronic background. The phenomenon was explained as arising from the Josephson-coupling plasmon of superconducting condensate. Together with the tr...
The magnetic behavior of iron sheathed magnesium diboride (MgB2) wires was investigated. Global magnetization measurements have shown unusual critical current density variations compare to a superconductor with no magnetic environment. Local quantitative studies, through MO images, are linked to these global magnetization measurements in order to better understand the observed results. It is sh...
The superfluid density, rho{s}, of the iron chalcogenide superconductor, FeSe1-x, was studied as a function of pressure by means of muon-spin rotation. The analysis of rho{s}(T) within the two-gap scheme reveals that the effect on both, the transition temperature T{c} and rho{s}(0), is entirely determined by the band(s) where the large superconducting gap develops, while the band(s) with the sm...
In this paper, we investigate the coherent quantum transport in grapheme-based ferromagnet-superconductor-ferromagent junctions within the framework of BCS theory using DBdG quasiparticles equation .The coherency with the finite size of superconductor region has two characteristic features subgap electron transport and oscillations of differential conductance. we show that periodic vanishing of...
In this paper, Bi-Sr-Ca-Cu-O (BCSCCO) system superconductor is made by the solid state reaction method. The effect of doping Pb, Cd, Sb, Cu and annealing time on the critical temperature and critical current density have been investigated. The microstructure and morphology of the samples have been studied by X-ray diffraction, scanning electron microscope and energy dispersive X-ray. The resu...
We report a novel experimental approach to point-contact Andreev reflection spectroscopy with diagnostic capability via a unique design for nanoscale normal metal/superconductor devices with excellent thermomechanical stability, and have employed this method to unveil the existence of two superconducting energy gaps in iron chalcogenide Fe(1+y)Te(1-x)Se(x), which is crucial for understanding i...
Abstract We investigate the collective mode response of iron-based superconductor Ba 1− x K Fe 2 As using intense terahertz (THz) light. In superconducting state a THz Kerr signal is observed and assigned to nonlinear coupling degrees freedom. The polarization dependence remarkably sensitive coexistence nematic order. absence order C 4 symmetric consistent with Higgs amplitude condensate. coexi...
Pairing symmetry is a fundamental property that characterizes a superconductor. For the iron-based high-temperature superconductors, an s(±)-wave pairing symmetry has received increasing experimental and theoretical support. More specifically, the superconducting order parameter is an isotropic s-wave type around a particular Fermi surface, but it has opposite signs between the hole Fermi surfa...
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